Method of uniting hard-steel alloys or metal alloys to soft-steel bars and the article of manufacture produced thereby



Patented May 20, 1924.

UNITED STATES PATIENT" OFFICE.

JEAN H. DE BATs, or WHITMAN, MASSACHUSETTS, A ssIGNoR, Biz MESNE Assrel i MENTS, TO ANATMOS METALS AND FURNACE CORPORATION, OF NEW YORK, N. Y.,

A CORPORATION OF DELAWARE,

METHOD OF UNITING HARD-STEEL ALLOYS OR METAL ALLOYS TO SOFT-STEEL BARS AND THE ARTICLE OF MANUFACTURE PRODUCED THEREBY.

No Drawing;

To all whom 2'25 may concern.-

Be it known that I, JEAN H. L. DE BATS, a subject of the Queen of Holland, residing at Vhitman, in the county of Plymouth and 5 State of Massachusetts, United States of America, have invented an Improved Method of Uniting Hard-Steel Alloys or Metal Alloys to Soft-Steel Bars and the Article of Manufacture Produced Thereby, of which the following is a specification.

This invention relates to a metal product, having a tough, strong, carbon steel body,

with a portion of much harder metal, such as' high speed steel, or metallic alloy, firmly united thereto, and to the method of making the same. The object of the invention is to produce a composite article, such as a tool it, having a tough, strong steel body, to

which is firmly united a portion of a much 0 harder metal body, having a high cutting quality.

In practice it has been found that when two bodies, such as above specified, are united by ordinary known methods, such, for

instance, as electric welding, or by first forming a tough steel body with a suitable cavity, and then pouring intosaid cavity a molten high speed steel or metallic alloy, the cut ting quality of the high speed steel or metallic alloy is materially diminished and cannot be restored by any known method of heat treatment.

In a prior application, filed by me, Serial No. 258,052, dated August 21, 1918, I have 5 described a metal product and method of making such product, which consists in placing a piece of tough steel, having a suitable cavity formed therein, in a metal mold, and then pouring into said cavity a molten body of'much harder metal, such as high speed steel, and which method is not open to the objections above stated. My present invention differs from that described in my prior application in that instead of welding a molten body of high speed steel or metallic alloy to a non-molten body of tough steel, I bring about the union by melting both bodies and uniting them by effecting diffusion of one body into the other at their point Application filed March 4, 1920. Serial No. 363,237.

of contact, with the result that the .two bodies are more firmly united than in the case of welding, and when cast into a suitable chill mold, the high speed steel or metallic alloy do not in any wise lose their cutting quality.

To carry my improved method into effect, I proceed as follows The two bodies, i. e., the high speed steel or metallic alloy and the tough steel are first melted separately, preferably in a nonoxidizing atmosphere and under temperature conditions suflicient to permit them to be poured easily. The bodies, when in the condition stated, are ready for pouring. To give these bodies the required shape and bring about the diffusion of the two bodies into each other at the point of contact, I make use of a chill mold, of any suitable shape and construction, depending, of course, upon the character and shape of the article to be produced, and into this mold I first pour the required quantity of high speed steel or metallic alloy, which flows into the position which it is to occupy in the finished article. Immediately thereafter, I pour into the mold, over the high speed steel or alloy, the required quantity of the tough steel, which flows into the position which it will occupy in the finished tool, after which the mold and the contained bodies are allowed to cool. When the molten body is sufliciently cooled, it will be found that a perfectly diffused union exists between the two bodies, and assuming that the chill imparted is suflicient, upon test the cutting quality of the high speed steel or alloy body will be found to be the same, or even greater than before this body was melted and poured as described.

Having thus described my invention, I claim:

1. The method of uniting high speed steel, or a body having high cutting quality, without heat treatment, to a tough steel body, which consists in separately melting these two bodies, then pouring into a chill mold of suitable shape, first the high speed steel or body, and then over such steel or body, a tough steel, I

2. The method of uniting a body having a high cutting quality, without heat treatment, to a tough steel body, which consists in first separately melting the two bodies, 5 then successively casting the bodies into the same mold, one over the other, and simul- In testimony whereof, I afiixmy signa taneously imparting a chill to said bodies.

ture, in the presence of two witnesses.

Witnesses JEAN H. L. DE BATS.

ERNST G. 81200121), I E. L. INGALLS. 

